SEC ownership of NORTHWESTERN CORP

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000073088.

Comparable stake leader

Robert C. Rowe

Disclosed value leader

Robert C. Rowe

Comparable rows

0/23

Latest evidence

16 Jun 2023

Top shareholders Insider holders Latest transactions
Parsed ownership sources
3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
Largest SEC-reported holder
Robert C. Rowe
Ranking: Comparable ownership first, then disclosed value
Ownership snapshot CIK-linked ownership evidence from parsed SEC filings. 1 signal
Latest parsed ownership date
16 Jun 2023
Freshness: Most recent filing date in this holder set
Issuer Names, identifiers, and filing context for this profile. 2 identity fields
Issuer CIK
0000073088
Issuer location
Sioux Falls, SD

Ownership snapshot

Top shareholders of NORTHWESTERN CORP (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
Robert C. Rowe
Disclosed value leader
Robert C. Rowe
Comparable rows
0/23
Latest evidence
16 Jun 2023
3/4/5 Highest disclosed value: $11,995,509 23 rows are not safely comparable across share classes. Showing 1-8 of 23 holder rows.

Quick read

Robert C. Rowe has the largest disclosed position value at $12M.

0 of 23 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Robert C. Rowe's linked filing trail.
Disclosed position value Top 5
Robert C. Rowe $12M
Brian B. Bird $8.38M
Dana J. Dykhouse $2.43M
H. Grahame Heather $1.85M
Bobbi L. Schroeppel $1.78M

Value bars compare disclosed positions; verify each figure against the linked filing evidence.

Detailed SEC evidence table Showing 1-8 of 23 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
Robert C. Rowe
3/4/5
CEO, Director
3/4/5
—
class O/S missing
$11,995,509
204,527 shares
 — 13 Dec 2022
Brian B. Bird
3/4/5
President and CEO
3/4/5
—
class O/S missing
$8,375,103
142,798 shares
 — 07 Mar 2023
Dana J. Dykhouse
3/4/5
Director
3/4/5
—
class O/S missing
$2,433,975
41,500 shares
 — 06 Jan 2023
H. Grahame Heather
3/4/5
General Counsel & VP
3/4/5
—
class O/S missing
$1,854,044
31,612 shares
 — 13 Dec 2022
Bobbi L. Schroeppel
3/4/5
VP HR, CC & Comm
3/4/5
—
class O/S missing
$1,783,019
30,401 shares
 — 07 Mar 2023
John D. Hines
3/4/5
VP - Supply & MT GA
3/4/5
—
class O/S missing
$1,768,298
30,150 shares
 — 07 Mar 2023
Pohl Curtis T.
3/4/5
VP - Asset Mgmt, Bus. Dvlpmt
3/4/5
—
class O/S missing
$1,542,436
26,299 shares
 — 07 Mar 2023
Linda G. Sullivan
3/4/5
Director
3/4/5
—
class O/S missing
$1,270,359
21,660 shares
 — 06 Jan 2023
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 04 Jul 2025.

Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value Sell value
Shares: 0 Shares: 0
Window (months) Buy shares Sell shares Buy value Sell value Net value
0-3 0 0 $0 $0 $0
3-6 0 0 $0 $0 $0
6-9 0 0 $0 $0 $0
9-12 0 0 $0 $0 $0

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 23 reporting-owner rows connected to NORTHWESTERN CORP. Open a relationship link for the CIK-to-CIK filing trail.

Rows
23
Largest Forms 3/4/5 holder
Robert C. Rowe
Net 12M change
$0
Latest report
16 Jun 2023
Name Relationship Holdings Value Past Year Net Change Change % Valuation Report Date
Robert C. Rowe CEO, Director $11,995,509 Mixed 13 Dec 2022
Brian B. Bird President and CEO $8,375,103 Mixed 07 Mar 2023
Dana J. Dykhouse Director $2,433,975 Mixed 06 Jan 2023
H. Grahame Heather General Counsel & VP $1,854,044 Mixed 13 Dec 2022
Bobbi L. Schroeppel VP HR, CC & Comm $1,783,019 Mixed 07 Mar 2023
John D. Hines VP - Supply & MT GA $1,768,298 Mixed 07 Mar 2023
Pohl Curtis T. VP - Asset Mgmt, Bus. Dvlpmt $1,542,436 Mixed 07 Mar 2023
Linda G. Sullivan Director $1,270,359 Mixed 06 Jan 2023
Anthony Thomas Clark Director $1,178,806 Mixed 06 Jan 2023
Michael R. Cashell Vice President - Transmission $1,134,408 Mixed 07 Mar 2023
Crystal Dawn Lail Chief Financial Officer $929,954 Mixed 07 Mar 2023
Jeffrey W. Yingling Director $845,616 Mixed 02 Feb 2023
Mahvash Yazdi Director $755,001 Mixed 02 Feb 2023
Britt E. Ide Director $593,831 Filing P/S 16 May 2023
Jeanne Vold Vice President of Technology $548,788 Mixed 07 Mar 2023
Larson Kent T. Director $287,150 Mixed 06 Jan 2023
Jan Robert Horsfall Director $256,594 Mixed 06 Mar 2023
Sherina M. Edwards Director $166,155 Mixed 09 May 2023
Jason Merkel VP - Distribution $133,722 Mixed 07 Mar 2023
Shannon Heim Vice President and GC $78,005 Mixed 07 Mar 2023

Recent insider transactions for NORTHWESTERN CORP

Showing up to 300 recent insider transactions from the last 12 months.

Insider Symbol Class Transaction % SEC-reported value SEC-reported price Shares Shares owned Date Ownership
No insider transactions were found in the last 12 months for this issuer.
* marks a reported price that did not pass the local price check.
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